Furnace



G. H. GIBSON.

FURNACE.

APPLICATION FILED NOV. 17, 1912.

In ventor HI'S 95 GEORGE E. GIBSON, or mom's-Lain, new :rr'msnr.

FURNACE. f

Specification-o1letters 'ljatente P t t May 1922 Applicatlon'filedNovember '17, 1:91-12. Serial No. 202,478.

To all whom it may concern:

Be it known that I, GEORGE H. Gnssooz, a citizen of the United States ofAmerica, and resident of Montclair, in the county of Es: sex and Stateof New Jerse have invented a certain new. and useful Improvement inFurnaces, of which the following isa true and exact description,reference being had to the accompanying drawings, which form a arthereof. g Y v y present invention relates to furnaces, and particularlyto furnaces for heating steam generating boilers. Theprima'ry object ofthe invention isto provide novela'nd improved means" for automaticallyproportioning the primary and secondary airsupplies to a furnace burningsolid fuel.

The various features of novelty which characterize my inventionarepointed out with particularity in the claims annexed hereto andforming a artof this s J'cification. For a better un erstanding 0 the invention, however, and the advantages possessed by it referene shouldbehnd.t0 the accompanying drawings anflcfdesc'riptive matter in which Ihave illustrated and de scribed a preferred embodiment of my invention.I

Of the drawings: I s

Figure 1 is a diagrammatic elevationwith parts broken away and insection of a steam generating plant.

Figure 2 is a partial section on the hue 2-2 of Figure'l.

In the drawin s," A represents the combustion chamber of the steam'generating furnace proper,and A the stack connectlon-or outlet from thechamber A for roducts'of combustion The draft throug the combustionchamber A may be regulated by a damper A in the connection B rep sentsthe water tubes, and C the steam and water drum of the steam generatingboiler heated by the 'hot' gases swenping through the combustion chamberA. represents'a superheating coil in the pipe connection leading fromthe steam-space of the drum C, to=the high pressure inlet of a steamturbine E, and D- represents a'suplerheatin coil located in thecombustion c amber and forming a part of the conduit leading from theexhaust of a high pressure stage of the turbine to thesteam inlet of alower pressure stage of theturbine- The inlet to thecombustion chamber A1s connected to the; gaseous outlet ;of a gas producer chamber F, Asshown, the connect1on.. is.d1rect, the combustion chamber Acompnsmga-portion which is located above, and 1n .f -ct forms acontinuation of the gas producerchamber F. At the lower end of the gasproducer is, an ordinary solid fuel grate F, arulxF? represents a doorthrou h which solid, fuel may be charged into t e gas producer from timeto time. G represents the-airsupply connection to the ash pit F?beneath-the rate F':. The amount of air passingginto t e' ash pitthroughthe air supply inlet G is controlled by a. steam 'et issuing fromthe axially disposed nozzle I l. The nozzle HT is supplied withsteamfrom the boiler. through the-steam supply line H. The amount ofsteamjdischarged through the nozzle H is'control1edby the throttlevalve" K, which is automatically regulated in a manner hereinafterdescribed. Thesec-..

'ondar'y air for burning the producer gas is supplied adjacent theinletto the combu's tion chamber. A through aconduit I, which isopen to theatmosphere at I and includes;- a loop I which projectsinto the smokestack-- outlet A, so that the secondary air is p-reheated more or lewby"the waste products of combustion leaving the boiler furnace.

The conduit I, in the construction shown, is' I straddling bifurcatedwith the forks the gas producer neck .portion or conduit through whichthe ro'ducer gas is supplied to the combustion clihmberA. Each fork I isopen at its inner edge to the ends of-the hollow grate bars J, whichextend across charge orifices J These bars may be many cases, but

the chamber F and are formed with dis-1;

at their upper edges, formed of cas'ti iron in at G and secondary air suplied through,

pipeI is thereby autom-aticaly regulated so as to maintainapredetermined percentage of carbon dioxide in the products of combustionleavingthe boiler furnace. The par.- ticular apparatus illustrated foraccomplish ing this result comprises means for continuously passing asmall amount of the waste products of combustion from the smoke.

where subjected unduly high temperatures should be m'adeof'more'refractory material. Interposed between-the stack connection A to thechamber O of a CG absorbing device Q. In the particuher form of thedevice 0 illustrated the chamber O is connected to a chamber by arestricted port U The chamber 0- is sepcreated by a perforated Wail Qfrom a chamber O". The letter communicates through restricted orifice Owith a chamber The chamber 0 is provided with a discharge outlet O sudblast nozzle H sugplied iith. steam through. the steam supply pipe HIinsures s suction out of the chamber through the outlet O The chamber isfilled with e pervious mass of some suitable CO absorbing material suchas caustic soda:

'l he chamber 0 is connected to the chamber U by piping P and is aisoconnected to the under end of seeded receptacle h con.-

sini a body of liquid It" into which s pipe open its upper end to theatmosphere d es to definite depth. ihe chamber U is connected totheupper end of rece tacle O; a body of iiquid Q, and rovided with cpipeQfl which {tends down into the iiquid to a definite depth and isopen at its upper end to the atmosphere With the apparatus thusdescribed when the parts are s'uitubiy proportioned, they operate tomaintari a definite vacuum in the chamber 0 and another definite,though. somewhat lower vacuum, in the chauib i These vacuums correspondto ti o I heads the recegtacies It and above is lower ends of the gripesR and 3 respectively: To accomplish i the suction oithe 1101 .2energetic enough at ail times to draw some atmospheric air the iiquid Rreceptacle It Any increase Within r ,abie limits in suction etfect or Hbeyond th required to it flow of air through the pipe it crease thevacuum in the cha "iii '2? up" cis 152- since any slight increase nvacuum will h ely increase the amount of air dr 'n into the chamberfrom. the re ceptacie The sir thus sdn A to diminish. the vacuum. in thechamber t and the vacuum in the ci'ieinber G is thus maintained, atapproximately the predctermined value The vacuum in the che cher U isregulated in a similar r liquid head above t is bottom oi the L Theexistence of a constant press iuiet side of the orifice U and at '5outlet side of the orifice U" tends to in -tuin constant flew througheach of hese orifices and a constantvccuuni in the chamber provided. thenercentuue of GU in the J. nace remains constant.

It the CO in the furnace WELStG gases di minishes smaller percentage ofthe gas tering' the chamber U is absorbed theand the vacuum in thechamber G is there by diminished. Conversely an increase in thepercentage of C0 in the furnace Waste gases resuits in an increasedabsorption of CU in the chamber 0 and an increase in the vacuum in thechamber 0. The pressure in the chamber O is thus a measure of thepercentage of GQ in the furnace Waste geses. The vacuum. in the chamber0 is transmitted. to the pressure chamber of the fluid pressure motor L.The flexible dispf rag 'i of the motor L is so connected to theregulating valve .K in the biast nozzie steam supply line that thedamper l LQis opened and more primary supplied when the amount of CU inthe Waste prod- "beiovv a predetermined percent age which it is desiredto maintain, and when. the amount of rises above the predeterminedpercentage, the vslve throttied to correspondinjy reduce the primary sirsupplied to the ash pit F? thereby restore the desired percentage of C0in the gaseous products combustion T he percentsge oi (1G in the furnacegases the apparatus tends to maintain m y be reied by adjusting counterbalance Weight L". An arrangement of the type described forms a noveland effective means for accurately proportioning the primary andsecondary air suppiied to a coincu furnace which is Weit adapted for.ith many difiierent kinds of furnaces e. special arrangement ofproducer and boiier furnace prcper disciosed herein possesses thefciiowing imnortant practical advantages addition to the general ac:-vantages airead r referred to. means einpioyed for feeding the secondaryair and adinhii it with. the producer gas aris' u from the iuei bed thegas producer insures u very ti s-rough admixture which is conducive tocient combustion pessessesthe advantegeot reducing; the re quired voiunie and particu height of the bciie. co -bustion. The ubsorption of heatft 1 bed by the Water tr cure of the ie amount or it is necessary supplyv;

order to avoid undue clii er-ii on the er absorptive s s 13 also e keepsdown temperature of .e gas, and there-- bv temperature of the combus- 1chamber tests and the grate it The b er in wh ch the secon known to me,it will be obvious to those skilled in the art thatchanges may be madein the form of the apparatus disclosed without departing from the spiritof the invention set forth in the appended claims,-'and that certainfeatures of my invention may sometimes be used with advantage without acorresponding use of other features.

Having now described my invention, what I claim as new and desire tosecure by Letters Patent, is:

1. In, a furnace having primary and secondary air supplies, and meansfor adjusting the ratio of primary to secondary air, the combinationtherewith, of means automatically responsive to the amount of CO in thewaste gases for adjusting the previously mentioned means to maintain apredetermined percentage of CO in the waste gases.

2. In a furnace having primary and secondary air supplies, means forvarying the total amount of air supplied to thereby vary the combustionrate, and means for regulating the ratio of primary and secondary airsupplied, the combination therewith of means automatically responsive tothe amount of CO in the waste gases for adjusting said ratio regulatingmeans as required' to maintain a predetermined percentage of CO in thewaste gases.

3. In a furnace having primary and sec- I ondary air supplies and meansfor regulating the rat1o of primary to secondary air, the combinationtherewith of means automatically responsive to the chemical compo-'sition of the gaseous product-s of combustion issulng from the furnacefor adjusting said ratio regulating means to'maintain a predeterminedcomposition of said gaseous .means in response to the chemicalcomposition of the gaseous products of combustion issuing from thefurnace so as to minimize the variations in the chemical composition ofsaid products dependent on said ratio.

5. In a furnace having primary and sec ondary air supplies and means forregulating the ratio of primary to secondary air,

the combination therewith of means automatically responsive to thefractional content of the gaseous products of combustion issuing fromthe furnace formed by a particular constituent of said gases, foradjusting said ratio regulating means as required to maintain saidfractional content approximately constant.

esoaes H. GIBSON.

